Bath tub



FIG. 1 is a front, top, left-side perspective view of a bath tub,showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof; and

FIG. 5 is a right-side elevation view thereof; and,

FIG. 6 is a left-side elevation view thereof.

CLAIM The ornamental design for a bath tub, as shown and described.